/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.slots;

import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
import org.apache.flink.util.Preconditions;

import java.io.Serializable;
import java.util.Objects;

/**
 * Represents the number of required resources for a specific {@link ResourceProfile}.
 */
public class ResourceRequirement implements Serializable {

	private static final long serialVersionUID = 1L;

	private final ResourceProfile resourceProfile;

	private final int numberOfRequiredSlots;

	private ResourceRequirement(ResourceProfile resourceProfile, int numberOfRequiredSlots) {
		Preconditions.checkNotNull(resourceProfile);
		Preconditions.checkArgument(numberOfRequiredSlots > 0);

		this.resourceProfile = resourceProfile;
		this.numberOfRequiredSlots = numberOfRequiredSlots;
	}

	public ResourceProfile getResourceProfile() {
		return resourceProfile;
	}

	public int getNumberOfRequiredSlots() {
		return numberOfRequiredSlots;
	}

	public static ResourceRequirement create(ResourceProfile resourceProfile, int numberOfRequiredSlots) {
		return new ResourceRequirement(resourceProfile, numberOfRequiredSlots);
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		ResourceRequirement that = (ResourceRequirement) o;
		return numberOfRequiredSlots == that.numberOfRequiredSlots &&
			Objects.equals(resourceProfile, that.resourceProfile);
	}

	@Override
	public int hashCode() {
		return Objects.hash(resourceProfile, numberOfRequiredSlots);
	}

	@Override
	public String toString() {
		return "ResourceRequirement{" +
			"resourceProfile=" + resourceProfile +
			", numberOfRequiredSlots=" + numberOfRequiredSlots +
			'}';
	}
}

